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17 July, 17:27

What is the sum of the geometric sequence 1, 3, 9, ... if there are 12 terms?

292,524

265,720

139,968

104,976

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  1. 17 July, 19:23
    0
    The sum of this geometric sequence is 265, 720.

    1 + 3 + 9 + 27 + 81 + 243 + 729 + 2187 + 6561 + 19683 + 59049 + 177147 = 265, 720

    You just multiply each number by 3 to find the sequence and then add those numbers.
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